How to customize the url of "Homepage"?

“My English is too good”, look up a lot of information, I’m already confused by all this stuff.

The artifacts I uploaded using Nexus Repository Manager(( were synchronized here.

I tried to sign up for an account here to see if there was a way to modify the “homepage” and I saw the “Add Namespace” button and then I tried to add the domain name and it said:

Namespace ‘org.example’ is already registered as an OSSRH Namespace. For help with OSSRH namespaces, please refer to our documentation.

What should I do now, I just want to modify the “Homepage“.